GPUImage滤镜

最新推荐文章于 2025-08-19 15:44:33 发布

一寸·光阴

最新推荐文章于 2025-08-19 15:44:33 发布

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文章标签： ios

本文链接：https://blog.youkuaiyun.com/YuanYuan13522855683/article/details/83311934

本文介绍了iOS中GPUImage库的各种滤镜效果，包括亮度调节、曝光控制、对比度增强、饱和度调整、灰度转换、色阶调整、褐色滤镜以及Haze和highlightAndShadow等效果，通过示例展示了不同滤镜对图像的改变。

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亮度调节GPUImageBrightnessFilter

    //亮度调节
    //创建一个亮度的滤镜
    _brightnessFilter = [[GPUImageBrightnessFilter alloc] init];
    _brightnessFilter.brightness = self.slider.value;
   //设置要渲染的区域
    [_brightnessFilter forceProcessingAtSize:self.inputImage.size];
    [_brightnessFilter useNextFrameForImageCapture];
  //获取数据源
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:self.inputImage];
    //添加上滤镜
    [stillImageSource addTarget:_brightnessFilter];
    //开始渲染
    [stillImageSource processImage];
    //获取渲染后的图片
    UIImage *newImage = [_brightnessFilter imageFromCurrentFramebuffer];
    //加载出来
    self.imgView.image = newImage;
    //brightness的范围[-1,1]![在这里插入图片描述](https://img-blog.youkuaiyun.com/20181023195325473?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1l1YW5ZdWFuMTM1MjI4NTU2ODM=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)
    _brightnessFilter.brightness = self.slider.value;

效果图
亮度调节

曝光GPUImageExposureFilter

 UIImage *image = [UIImage imageNamed:@"meinv.jpg"];
    _exposureFilter = [[GPUImageExposureFilter alloc]init];
    _exposureFilter.exposure =sender.value;
    [_exposureFilter forceProcessingAtSize:image.size];
    [_exposureFilter useNextFrameForImageCapture];
    //    //获取数据源
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:image];
    //添加上滤镜
    [stillImageSource addTarget:_exposureFilter];
    //开始渲染
    [stillImageSource processImage];
    //获取渲染后的图片
    UIImage *newImage = [_exposureFilter imageFromCurrentFramebuffer];
    //加载出来
    self.imageView.image = newImage;

效果

在这里插入图片描述

对比度GPUImageContrastFilter

 UIImage *image = [UIImage imageNamed:@"meinv.jpg"];
    _constrastFilter = [[GPUImageContrastFilter alloc]init];
    _constrastFilter.contrast =sender.value;
    [_constrastFilter forceProcessingAtSize:image.size];
    [_constrastFilter useNextFrameForImageCapture];
    //    //获取数据源
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:image];
    //添加上滤镜
    [stillImageSource addTarget:_constrastFilter];
    //开始渲染
    [stillImageSource processImage];
    //获取渲染后的图片
    UIImage *newImage = [_constrastFilter imageFromCurrentFramebuffer];
    //加载出来
    self.imageView.image = newImage;

效果

在这里插入图片描述

饱和度GPUImageSaturationFilter

UIImage *image = [UIImage imageNamed:@"meinv.jpg"];
    _saturationFilter = [[GPUImageSaturationFilter alloc]init];
    _saturationFilter.saturation =sender.value;
    [_saturationFilter forceProcessingAtSize:image.size];
    [_saturationFilter useNextFrameForImageCapture];
    //    //获取数据源
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:image];
    //添加上滤镜
    [stillImageSource addTarget:_saturationFilter];
    //开始渲染
    [stillImageSource processImage];
    //获取渲染后的图片
    UIImage *newImage = [_saturationFilter imageFromCurrentFramebuffer];
    //加载出来
    self.imageView.image = newImage;

效果

饱和度

灰度

 UIImage *image = [UIImage imageNamed:@"meinv.jpg"];
    _gammaFilter.gamma = self.slider.value;
    [_gammaFilter forceProcessingAtSize:image.size];
    [_gammaFilter useNextFrameForImageCapture];
    //    //获取数据源
    _stillImageSource = [[GPUImagePicture alloc]initWithImage:image];
    //添加上滤镜
    [_stillImageSource addTarget:_gammaFilter];
    //开始渲染
    [_stillImageSource processImage];
    //获取渲染后的图片
    UIImage *newImage = [_gammaFilter imageFromCurrentFramebuffer];
    //加载出来
    self.imageView.image = newImage;

效果

色阶LevelsFilter

 UIImage *image = [UIImage imageNamed:@"meinv.jpg"];
    [_levelsFilter setMin:0.0 gamma:sender.value max:1.0];
    [_levelsFilter forceProcessingAtSize:image.size];
    [_levelsFilter useNextFrameForImageCapture];
    //    //获取数据源
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:image];
    //添加上滤镜
    [stillImageSource addTarget:_levelsFilter];
    //开始渲染
    [stillImageSource processImage];
    //获取渲染后的图片
    UIImage *newImage = [_levelsFilter imageFromCurrentFramebuffer];
    //加载出来
    self.imageView.image = newImage;

效果

褐色SepiaFilter

 UIImage *image = [UIImage imageNamed:@"meinv.jpg"];
    [_sepiaFilter forceProcessingAtSize:image.size];
    [_sepiaFilter useNextFrameForImageCapture];
    //    //获取数据源
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:image];
    //添加上滤镜
    [stillImageSource addTarget:_sepiaFilter];
    //开始渲染
    [stillImageSource processImage];
    //获取渲染后的图片
    UIImage *newImage = [_sepiaFilter imageFromCurrentFramebuffer];
    //加载出来
    self.imageView.image = newImage;

效果 yuantu

Haze

 UIImage *image = [UIImage imageNamed:@"meinv.jpg"];

    _hazeFilter.distance = sender.value;
    [_hazeFilter forceProcessingAtSize:image.size];
    [_hazeFilter useNextFrameForImageCapture];
    //    //获取数据源
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:image];
    //添加上滤镜
    [stillImageSource addTarget:_hazeFilter];
    //开始渲染
    [stillImageSource processImage];
    //获取渲染后的图片
    UIImage *newImage = [_hazeFilter imageFromCurrentFramebuffer];
    //加载出来
    self.imageView.image = newImage;

在这里插入图片描述

highlightAndShadow

    UIImage *image = [UIImage imageNamed:@"meinv.jpg"];
    
    _highlightShadowFilter.highlights = sender.value;
    [_highlightShadowFilter forceProcessingAtSize:image.size];
    [_highlightShadowFilter useNextFrameForImageCapture];
    //    //获取数据源
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:image];
    //添加上滤镜
    [stillImageSource addTarget:_highlightShadowFilter];
    //开始渲染
    [stillImageSource processImage];
    //获取渲染后的图片
    UIImage *newImage = [_highlightShadowFilter imageFromCurrentFramebuffer];
    //加载出来
    self.imageView.image = newImage;

在这里插入图片描述